Vitamin B12 (Cyanocobalamin) Test

• To diagnose vitamin B12 deficiency, considering symptoms like fatigue, weakness, numbness, or memory problems.
• To assess vitamin B12 absorption issues, even if dietary intake seems sufficient.
• To identify the underlying cause of a suspected B12 deficiency, such as dietary habits or digestive problems.
• To determine the need for further testing or treatment, like B12 supplements.
• The test is important for pregnant women, elderly people and psychiatric inpatients with non-cognitive problems.

The Vitamin B12 Cyanocobalamin Test measures the level of vitamin B12 in your blood. Cyanocobalamin is a specific form of vitamin B12 commonly used in this test.

Vitamin b 12 test requires a blood sample. A tourniquet (elastic) band is placed tightly on the upper arm. The patient is then asked to make a fist. This helps in the build-up of blood filling the veins. The skin is disinfected before needle insertion and the blood sample is collected in vacutainer.

• High levels of Vitamin B12 may be seen in Kidney failure, Diabetes, Liver disease and with intake of Vitamin C/Vitamin A/Estrogens. 
• Low levels of Vitamin B12 may be seen in Anemia, Hyperthyroidism, worm infestation, pregnancy, smoking, hemodialysis, intake of aspirin/ anticonvulsants/ colchicine/ ethanol/ contraceptive hormones and multiple myeloma

People with the following conditions are given vitamin B12:

• Frail bones (osteoporosis)
• Men with infertility
• Infected tendons
• Heart problems
• Alzheimer's illness
• Intake problems
• Bowel inflammation disease
• Asthma
• Cervical and other cancer prevention
• Mental illness and sleep issues
• Diabetes

There are no specific preparations required for the test. However, it is recommended that you consult with your healthcare provider before taking the test, as they may have specific instructions or recommendations based on your individual medical history and current health status.